System with DLL

Details System with DLL System with DLL

1999-01-25

2000-10-31

Le, Dinh T.

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Synchronizing

327291, 327149, 327245, 327270, 327237, H03L 706

Patent

active

061408549

ABSTRACT:
A system (50) has a shifting delay circuit (60) which provides a variable delay for delaying a source clock and a delay locked loop (DLL) (70) which includes a delay line (72) which provides a variable delay for delaying the source clock. The delay line (18) has its delay varied by a counter (74). The counter (74) is incremented in order to change the delay. The shifting delay circuit (60) is based on half periods of a reference clock (GCLK) which has a known relationship to the source clock. The total delay for the source clock is a combination of that provided by shifting delay circuit (60) and delay line (72). The delay line (72), which requires relatively large amounts of die area in an integrated circuit can be smaller in size due to the usage of shifting delay circuit (60).

REFERENCES:
patent: 4689581 (1987-08-01), Talbot
patent: 5271040 (1993-12-01), Clark
patent: 5373255 (1994-12-01), Bray et al.
patent: 5719856 (1998-02-01), May
patent: 5995441 (1999-11-01), Kato et al.
patent: 6028463 (1999-11-01), Albu et al.

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